presidential candidate mitt romney drops by education nation summit. that's where peter alexander is this morning. peter, good morning. >> reporter: natalie, good morning to you. at the united nations today president obama will confront unrest in the middle east, in the muslim world specifically, warning about what he would call forces that would drive us apart. >>> the differences between the two candidates on foreign policy are now taking center stage. in the must win battleground of colorado, mitt romney previewed his foreign policy argument against the president. >> he said the developments in the middle east are bumps in the road. yeah, that was my reaction. bumps in the road? we had an ambassador assassinated. these are not bumps in the road. these are human lives. >> the white house called that assault desperate and offensive. romney was attacking the president's comments on "60 minutes" describing recent unrest in the middle east. >> i was pretty certain and continue to be pretty certain there are going to be bumps in the road. because in a lot